The Rf1200 visor can be open in several position and I pretty much use all of the settings. Visor is up when I am just rolling out, then I close the visor (not locked) then when I get on the highway I locked the visor. this is pretty typically. I even play more with the dark visor, its a battle to get air in but still protect my eyes and shade from the sun. There is more but...
A member has said there is nothing to worry about.
EVOEX K6 has a centre positioned release, never had an issue with hand block as it's more around your chin
Truth be told, I have never owned a centre positioned release helmet, So I don't know